1990 MITSUBISHI SPYDER warning light

When ignition key is turned ABS warning lightProbable.
does not illuminate.
[Comment]The ABS-ECU uses the the which is cut when the ignition switch is’l o f
turned to “START”. The ABS light uses power which is not cut even
l when the ignition switch is turned to “START”.Accordingly, because the power to the ABS-ECU is st
opped in “START” position,
if the light does not illuminate at this time, the cause is a problem in the __ light illumination circuit in the valve relay.
N GMeasure at hydraulic unit connector NG_..l Disconnect the connector and mea- Repair
sure at the harness side.lVoltaae between terminal and bodv
v o l t a g e trouble symptom.
Replace the hydraulic unit.
INSPECTION PROCEDURE 6
The ABS warning light flashes once after the igniti on key
Probable cause
is turned to “ON”. The light
when
is turned to “START”, and when the is to
it flashes once.I[Comment]l Malfunction of wiring harness or When power flows, the ABS-ECU turns on the warning light for approximately secondl Malfunction of ABS-ECU
while it performs a valve relay test. If there is a break in the harness between the
ECU and the
light illuminates only when the valve relay is off in valve
relay test, etc.
NGMeasure at ABS-ECU connector Check the connectors:
l Disconnect the connector and mea- a n d Repair
sure at the harness side.
combination meter and the ABS-ECU.Repair, if
.
,
Repair
OK
Check trouble symptom. Replace the ABS-ECU.
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ABS Troubleshooting. ,
Terminal No.Check pointCheck condition,
Ignition OFFo v
Rear solenoid valve (Output)
Ignition switch: ON Batterypositive
voltage
Relay power supply (Output) Ignition switch: OFF
o v
2Ignition switch: ON Battery positive voltage
Generator (Input) Ignition switch: ON (while engine is stopped)
2-5
4Ignition switch: ON (while engine is running) Battery positive
voltage
17
F.L. solenoid valve (Output) Ignition switch: OFF
Ignition switch: ONo v
Batterypositive
voltage
18
19
Ignition switch (Input)
F.R. solenoid valve (Output) Ignition switch: ON
Ignition switch: START
Ignition switch: OFF
Ignition switch: ON Battery
voltage
o v
o v
Battery
voltage positive
positive
22
23 Valve relay monitor (Input)
Ignition switch: OFF
o v
Ignition switch: ON
,
Diagnosticcommunication
Scan tool: connected
(Input/Output)tion with the scan
24
Diagnostic selection (Input) Scan tool: disconnectedScan tool: connectedo v
S c a n t o o l : d i s c o n n e c t e d
Approx. 12
25ABS warning light (Output) Ignition ON Battery
voltage positive
29
Stop light switch (Input)
Ignition switch: ON (stop light switch ON) 5 or more
Ignition switch: OFF (stop light switch OFF) 1.5
or more
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A B S
HYDRAULIC UNIT (HU) CHECK
Caution
35200170111
Turn the ignition switch off before connecting ordisconnecting the scan tool.
1.
up the vehicle and support the vehicle with rigid
racks placed at the specified jack-up points or pla ce the
wheels which are checked on the rollers of the brak ing
force tester.
Caution
1.The roller of the braking force tester and the tire
be dry during testing.
2.When testing the front brakes, apply the parking
brake, and when testing the rear brakes, stop the
front by chocking them.
2.Release the parking brake, and feel the drag force (drag
torque) on each road wheel.. __
When using the braking force tester, take a reading of’
the brake drag force.
3. Turn the ignition key to ‘the OFF position and
scan tool as shown in the diagram.
4.After checking that the shift lever or
lever is in neutral, start the engine.
NOTE
1.At this time, the ABS system will switch scan
tool mode -and the
warning light will
2.When the ABS has’ been interrupted by the -fail-saf e
function, the tool actuator testing cannot be
used.
5. Use the scan tool to force-drive the actuator.
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ABSOn-vehicle Service
Engine (Turbo)>When booster cables are used to start the engine when the
battery is completely
immediately driven without waiting for the battery to
itself to some extent, the engine may, making
driving difficult. 1’
This happens because ABS consumes. a great amount
current for its self-check function. The remedy is to either
allow the battery to recharge
or to remove the
fusible link for circuit, thus disabling the anti-lock brake
system.
The ABS warning light will illuminate, when link
(for
is removes.
After the battery has sufficiently charged, fusible
link (for
and restart the engine; then sure
the
warning light is not, illuminated.

ABS CHECK
A B S
1. When the ignition turned to ABS
warning light flashes 4 times during a to
then off.
2.When the ignition to the
warning light remains
3.When the ignition switch’ turned back to the the
ABS warning light times then
switched off. ,
4. If the illumination is other than the the
diagnostic trouble codes.
ABSIlluminated
light
Not illuminated
Ignition
switch
0 0 0 0 3 6 2 5
INSPECTION CHART FOR TROUBLE
Get an understanding the trouble symptoms and check according the procedure chart.
Trouble symptom
Communication with scan
tool is not possible.Inspection Reference’
procedure
page No.,
Communication with all systems is not possible.
Communication with ABS only is not possible.
When the ignition key is turned to “ON” (engine sto pped), the ABS warning light does
3not illuminate.
After the engine starts, the ABS warning light rema ins illuminated.
4
When the ignition key is turned to “START”, the ABS warning light does not5
illuminate.
After the ignition key is turned to “ON”, the waining light blinks once, and when6turned to “START”, it illuminates. When returned to “ON”, the light flashes once, and
then switches off.
Faulty ABS operation Unequal braking bower on both sides
. braking power
ABS operates under normal braking conditions
ABS operates before vehicle stops under normal braking conditions
Large brake pedal vibration (Caution 2.)
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ABS Troubleshooting
INSPECTION PROCEDURE 3
ignition key is turned to “ON’? (engine stopped),ProbableABS warning light does not illuminate
[Comment]When power is supplied to the ABS-ECU, the valve relay changes from to OFF ON by the initial check, and thus even if there is a problem with the circuit betweenABS warning light and ABS-ECU, the light will illum inate once when the valve relayis OFF.Accordingly, the cause of the light not illuminating is probably an open circuit in the
light power circuit, a blown light bulb, or an open circuit in both the circuit between
the ABS
liaht and the ABS-ECU and the circuit between the ABS
l Blown fuselBurntout light. bulblMalfunction of wiring. or connector
.
light and the relay.When other lights also do not illuminate, the cause is probab ly a blown fuse.
N GNG ,
Measure at combination meter connector Checkl and l Disconnect the connector and mea-
l Disconnect the connector and mea-
sure atthe combination meter side.
l Continuitv between terminals
OK Continuity
OK
Not
Replace combination meter.
, Check the harnesses between the valve relay and the combination meter,
a n d b e t w e e n t h e A B S - E C U a n d
combination meter (common section).
Repair, if necessary.
INSPECTION PROCEDURE 4
Even after the engine is started, the ABS warning l ight Probable cause ,
remains illuminated.
[Comment]There is probably a short in the ABS light illumination l Malfunction of meter
l Malfunction of valve relay
l Malfunction of ABS-ECU
l Malfunction of wiring
NOTE
This trouble symptom is limited to cases where comm unication with the scan tool is
supply is normal) and the diagnostic trouble code is a normal diagnostic trouble code.
Disconnect the ABS-ECU connector Short circuit inside the combination meter or in the Does the ABS warning light remain illuminated? between the combination meter and the ABS-ECU.
NO
Replace the ABS-ECU.
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,
INSPECTION PROCEDURE 5
When ignition key is turned to “START”, ABS warning light Probable
does not illuminate.
[Comment]The ABS-ECU uses the power to the which is cut when the ignition switch is M a l f u n c t i o n
turned to “START”. The ABS light uses power which is not cut evenl
M a l f u n c t i o n o f when the ignition switch is turned to “START”.Accordingly, because the power to the ABS-ECU is st opped in “START” position, .if the light does not illuminate at this time, the cause
is a problem in the light illumination circuit in the valve relay.,
Measure at NG
Disconnect the connector and
OK
the unit.
INSPECTION PROCEDURE 6
and Repair
Check trouble svmotom.
meter and the hydraulic
The ABS warning light flashes once after the igniti on key
is turned to “ON”. The light illuminates when the i gnitionProbable cause ,
key is turned to “START”, and when the key is retur
ned to
“ON”, it flashes once.
[Comment] Malfunction of harness or connectorWhen power flows, the ABS-ECU turns on the light for approximately 1 second Malfunction of while it performs a valve relay test. If there is a break in the harness between theECU and the light illuminates only when the valve relay is off in the valve
relay test, etc.
Measure at ABS-ECU connector l Disconnect the connector and mea-
sure at the harness side.
Ignition switch ON
Voltage between terminal 25 and body
ground
OK Battery positive voltage
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OK
Check the harness between thecombination meter and the ABS-ECU. if
Repair
l
OK
Check trouble symptom.
NG Repair
NG Replace the

A B S Troubleshooting
9
Terminal No.Check pointCheck condition Normal condition
2Relay power supply (Output)
Ignition switch: OFFo v
Ignition switch: ON Battery positive
voltage
6
1.7
sensor (Input) Ignition switch: ON (Vehicle parked on a
Approx. 2.5
level surface). .
F.L. solenoid valve (Output)Ignition switch: OFFo v
Ignition switch: ON Battery positive
voltage
18Ignition switch (Input) switch: ON Battery positive
voltage
22Valve relay monitor (Input) Ignition switch: START
o v
ignition switch: OFFo v
Ignition switch: ON
voltage
Diagnostic communication
(Input/Output)
Scan tool: connected Serial
with
Scan disconnected
Diagnostic selection (Input)
Scan tool: connected .
Scan tool: Approx. 12 __
ABS warning light (Output) Ignition switch: ON
Stop light switch (Input)Ignition switch: ON (stop light switch ON) or more
Ignition switch: OFF (stop light switch more
O F F ), . .
F.R. (R.R.) solenoid valve (Out-
Ignition switch: OFF
Ignition switch: ON Battery positive,
voltage
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